/* Global variables. */
:root {
	/* Set sans-serif & mono fonts */
	--sans-font: -apple-system, BlinkMacSystemFont, "Avenir Next", Avenir,
		"Nimbus Sans L", Roboto, "Noto Sans", "Segoe UI", Arial, Helvetica,
		"Helvetica Neue", sans-serif;
	--mono-font: Consolas, Menlo, Monaco, "Andale Mono", "Ubuntu Mono",
		monospace;

	/* Default (light) theme */
	--bg: #fff;
	--accent-bg: #f5f7ff;
	--text: #212121;
	--text-light: #585858;
	--border: #898ea4;
	--accent: #0d47a1;
	--code: #d81b60;
	--preformatted: #444;
	--marked: #ffdd33;
	--disabled: #efefef;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
	:root {
		color-scheme: dark;
		--bg: #212121;
		--accent-bg: #2b2b2b;
		--text: #dcdcdc;
		--text-light: #ababab;
		--accent: #ffb300;
		--code: #f06292;
		--preformatted: #ccc;
		--disabled: #111;
	}
	/* Add a bit of transparency so light media isn't so glaring in dark mode */
	img,
	video {
		opacity: 0.8;
	}
}

/* Reset box-sizing */
*,
*::before,
*::after {
	box-sizing: border-box;
}

/* Reset default appearance */
textarea,
select,
input,
progress {
  -webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;
}

html {
	/* Set the font globally */
	font-family: var(--sans-font);
	scroll-behavior: smooth;
}

/* Make the body a nice central block */
body {
	color: var(--text);
	background-color: var(--bg);
	font-size: 1.15rem;
	line-height: 1.5;
	display: grid;
	grid-template-columns: 1fr min(45rem, 90%) 1fr;
	margin: 0;
}
body > * {
	grid-column: 2;
}

/* Make the header bg full width, but the content inline with body */
body > header {
	background-color: var(--accent-bg);
	border-bottom: 1px solid var(--border);
	text-align: center;
	padding: 0 0.5rem 2rem 0.5rem;
	grid-column: 1 / -1;
}

body > header h1 {
	max-width: 1200px;
	margin: 1rem auto;
}

body > header p {
	max-width: 40rem;
	margin: 1rem auto;
}

/* Add a little padding to ensure spacing is correct between content and header > nav */
main {
	padding-top: 1.5rem;
}

body > footer {
	margin-top: 4rem;
	padding: 2rem 1rem 1.5rem 1rem;
	color: var(--text-light);
	font-size: 0.9rem;
	text-align: center;
	border-top: 1px solid var(--border);
}

/* Format headers */
h1 {
	font-size: 3rem;
}

h2 {
	font-size: 2.6rem;
	margin-top: 3rem;
}

h3 {
	font-size: 2rem;
	margin-top: 3rem;
}

h4 {
	font-size: 1.44rem;
}

h5 {
	font-size: 1.15rem;
}

h6 {
	font-size: 0.96rem;
}

/* Prevent long strings from overflowing container */
p,
h1,
h2,
h3,
h4,
h5,
h6 {
	overflow-wrap: break-word;
}

/* Fix line height when title wraps */
h1,
h2,
h3 {
	line-height: 1.1;
}

/* Reduce header size on mobile */
@media only screen and (max-width: 720px) {
	h1 {
		font-size: 2.5rem;
	}

	h2 {
		font-size: 2.1rem;
	}

	h3 {
		font-size: 1.75rem;
	}

	h4 {
		font-size: 1.25rem;
	}
}

/* Format links & buttons */
a,
a:visited {
	color: var(--accent);
}

a:hover {
	text-decoration: none;
}

button,
[role="button"],
input[type="submit"],
input[type="reset"],
input[type="button"],
label[type="button"] {
	border: none;
	border-radius: 5px;
	background-color: var(--accent);
	font-size: 1rem;
	color: var(--bg);
	padding: 0.7rem 0.9rem;
	margin: 0.5rem 0;
}

button:enabled:hover,
[role="button"]:not([aria-disabled="true"]):hover,
input[type="submit"]:enabled:hover,
input[type="reset"]:enabled:hover,
input[type="button"]:enabled:hover,
label[type="button"]:hover {
	filter: brightness(1.4);
	cursor: pointer;
}

button:focus-visible:where(
		:enabled,
		[role="button"]:not([aria-disabled="true"])
	),
input:enabled:focus-visible:where(
		[type="submit"],
		[type="reset"],
		[type="button"]
	) {
	outline: 2px solid var(--accent);
	outline-offset: 1px;
}

code,
pre,
pre span,
kbd,
samp {
	font-family: var(--mono-font);
	color: var(--code);
}

pre code {
	color: var(--preformatted);
	background: none;
	margin: 0;
	padding: 0;
}

progress {
	width: 100%;
}

progress:indeterminate {
	background-color: var(--accent-bg);
}

progress::-webkit-progress-bar {
	border-radius: 5px;
	background-color: var(--accent-bg);
}

progress::-webkit-progress-value {
	border-radius: 5px;
	background-color: var(--accent);
}

progress::-moz-progress-bar {
	border-radius: 5px;
	background-color: var(--accent);
	transition-property: width;
	transition-duration: 0.3s;
}

progress:indeterminate::-moz-progress-bar {
	background-color: var(--accent-bg);
}

.hidden {
	display: none;
}